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1.1 Unit description
Description:
The appliance is intended for domestic use,
i.e. h. it can be used safely by untrained per-
sons. The appliance can also be used in a
non-domestic environment, e.g. in a small bu-
siness, as long as it is used in the same way.
Any other use beyond that described shall be
deemed inappropriate. Observation of these
instructions and of instructions for any acces-
sories used is also part of the correct use of
this appliance. Any changes or conversions to
the appliance void any warranty.
The instantaneous water heater heats water as
it flows through the appliance. The hot water
outlet temperature can be regulated infinitely.
The set temperature appears on the display.
Above a flow rate of 2.5 l/min the control swit-
ches on the right heating power depending
on the temperature setting and the cold water
temperature.
1.2 The main features in brief
Display with temperature
indication
Temperature selector
By turning the adjustment button the re-
quired temperature can be infinitely adju-
sted and read off on the display.
If with the tap fully open and maximum
temperature setting a sufficient outlet
temperature is not reached, more water is
flowing through the unit than the heating
element can heat. In this case the water
quantity must be reduced accordingly at the
tap.
1.3 Safety instruction
There is a risk of scalding at outlet
temperatures above 43 °C.
Where children or persons with limited
physical, sensory or mental capabilities are
to be allowed to control this equipment,
ensure that this will only happen under
supervision or after appropriate instructions
by a person responsible for their safety.
Children should be supervised to ensure
that they never play with the equipment.
Risk of scalding!
If this is unavoidable, we recommend a
permanent temperature limit (see „Tempe-
rature cut-out“).
1. Operating instructions for the user and the qualified installer
1.6 Thermal cut-out
A thermal cut-out at 43 °C can be set by the
qualified installer.
1.7 External remote operation
The temperature can be set externally via the
radio remote control FFB 1 and FFB 2 (see
“7. Special fittings”).
1.8 Recommended setting
Operation with thermostatic fitting
The temperature must be set on the device to
the maximum value.
1.9 First Aid in the event of
faults
• Check the fuses
• Check that the fittings and shower con-
trols are free of limescale or dirt contami-
nation, see also “6. Fault finding”.
If a qualified installer is called in for a current
problem, he must be given a few details from
the unit rating plate (
A
20) so that he can
provide better and faster help:
DEL . . SLi Nr.: . . . . . . - . . . . - . . . . . .
1.10 Care and maintenance
Maintenance work, such as checking
electrical safety, may only be carried out
by a qualified installer.
All that is needed to clean the housing is a
damp cloth. Do not use any abrasive or caustic
cleaning substances.
1.11 Instructions for Installation
and Use
Follow these instructions carefully, and,
in the event of change of ownership, pass
them on to the new user. If any maintenance
or repair work is necessary, give them to the
qualified installer for him to read.
1.4 Important information
If the water supply to the appliance is
interrupted, e.g. because of a risk of
frost, or work on the water pipe, the following
measures must be taken prior to bringing the
appliance back into use:
1. Remove the fuses and/or trip the MCBs, or
switch off the appliance by means of the
temperature selector (“OFF” position).
2. Open a draw-off valve downstream of the
equipment until all air has been purged
from the cold water supply line and the
equipment.
3. Replace the fuses and/or reset the MCBs
or switch the appliance back on.
1.5 Hot water output
Cold water temperatures vary depending on
the time of year. The following maximum out-
put volumes, or mixed water volumes, can be
achieved with these different cold water inlet
temperatures (see Table):
ϑ
1
= Cold water inlet temperature
ϑ
2
= Mixing water temperature
ϑ
3
= Output temperature.
• Useful temperature:
– approx. 38 °C: For example, for showers,
hand basins, filling baths, etc.
– approx. 60 °C: For dishwashers and when
using thermostatic fittings.
ϑ
2
= 38 °C (Mixing water temperature)
18 kW 21 kW 24 kW 27 kW
ϑ
1
l/min *
6 °C 8.0 9.4 10.7 12.1
10 °C 9.2 10.7 12.3 13.8
14 °C 10.7 12.5 14.5 16.1
ϑ
3
= 60 °C (Output temperature)
18 kW 21 kW 24 kW 27 kW
ϑ
1
l/min *
6 °C 4.8 5.6 6.4 7.2
10 °C 5.2 6.0 6.9 7.7
14 °C 5.6 6.5 7.5 8.4
ϑ
3
= 50 °C (Output temperature)
18 kW 27 kW
ϑ
1
l/min *
6 °C 5.9 8.8
10 °C 6.4 9.7
14 °C 7.2 10.7
* The values in this table relate to a supply
voltage of 400 V. The actual outlet volume is
subject to the available supply pressure and
mains voltage.
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